Plug cock



Jan. 30, 1934. v

J. c. MARTIN, JR

' PLUG COCK 2 sheets-sheet 2 Original Filed Feb.l 5| 1921 INVENTOR.

' ATTORNEY.

Reissued Jap. so, 1934 UNITED STATES PATENT OFFICE PLUG COCK Jesse C. Martin, Jr., San Francisco, Calif., as-

signor to Walworth Patents Inc., Boston, Mass., a corporation of Massachusetts Original No. 1,416,732, dated May 23, 1922, Serial No. 442,862, February 5, 1921. Application for reissue August 31, 1923. Serial No. 660,453

11' Claims. (Cl. 251-93) The hereinafter described invention relates to .closures in pipe lines for stopping or throttling the iiuid Iiow therethrough embodying constructive improvements over my United States Letters Patent No. 1,365,116, entitled "Plug cocks, is-

sued January 11th, 1921.

Y lOne oi* the'objects of the invention is to provide better means for introducing and retaining the lubricant forced under high pressure between the plug and plug seat surfaces so that,

after the lubricant is introduced through the inlet and communicating ports provided for Vits ,movement it not pass back and waste out of the inlet due to the pressure built up in the 15 ports when it is forced in, nor will the fluid pres-` surein the cock be permitted to pass through the inlet upon dissipation of the lubricant it being desirable that both lubricant and ilud pressure, so far aspossible, be retained in the lubricant ducts or passages so as to automatically contnue the lubricant advance to the plug and plug seat surfaces after the grease gun is removed and to prevent leakage during a lubricant iilling operation, and in the accomplishment of this, I -provide a check valve controlled lubricant inlet which will prevent the lubricant exit or pressure of the fluid flow in the cock therethrough.

A further object of the invention is to provide a diaphragm between the end ofthe plug and the plate aiiixed to the casing-which will form a tight joint between the casing and plate, as-

well as a movable tight joint between the diaphragm and the ,end of the plug, thereby ef- `fectively serving to keep the lubricant pressure' up within the valve by checking its passage in this direction, as well as stopping any uid pressure escapement to the atmosphere by the end oi the plug, the constancy of the movable tight 4o joint being assured by a resilient member whichpresses the diaphragm against the joint surface on the plug, automatically compensating for any wear, as well as eliminating the use of a gland and stumng .box which has to beperiodically i5 screwed up and repacked,`and owing to the inaccessible places where these valves are installed such packingis frequently neglected, detracting materially from the general eiilciency of the valve.

'50 For the purpose of better understanding the invention, reference is'hereby made to the a'ccompanying drawings, 'in which- Fig. 1 is a vertical section taken through the center of a plug cockof my improved construction. A

Fig. 2 is a horizontal section taken approximately on the lineA 2-2 of l. Fig. 3 is a horizontal section taken approximately on the line 3 3 of Fig. 1.

Fig. 4 is a vertical section of a plug cock show- 60 'ing a modification.

Referring by numerals to the Aaccompanying drawings, -10 designates the. body or casing of the cock, the same being provided with oppositely arranged internally threaded tubular poro5 tions, 11, for pipe connections, and centrally arranged within the body or casing is a conical valve seat, 12.

Fitting snugly within the valve seat 'and adapted to rotate therein is a conical plug,'13, having 10 a .diametrically arranged opening, 14, that is adapted to register with 'the openings through the tubular members, '11, and formed integral with and projecting upwardly' from the body of the plug is a short cylindrical stem, 15. 7

Projecting upwardly from the top of this stem,

15, is an externally threaded stem portion, 16, and projecting. upwardly from the upper end thereof is a square or non-circular member, 1'7, that is adapted to receive a valve operating memso ber such as a hand lever or wrench. n .Y

Formed in the outer face of the body of plug 13, are diametrically opposed vertically disposed grooves, 18, the lower ends of which terminate in a planel slightly above the lower end of the plug. The upper ends of these lubricant' receiving grooves communicate with the ends of a diametrically arranged duct or passageway, 19, the latter being formed through the upper portion of the plug, 13, and this duct orpassageway, 19, 9o intersects the lower end of axially disposed ductor passageway, 20, that isi'ormed through stem, 15, threaded member, 16, and the angular portion, 17, of the stem.

The ducts or passageways just described pro- .95 vide means for delivering lubricant, such as grease or heavy oil, directly to the conical valve seat, 12, and the external surface of plug, 13, said lubricant being delivered into the upper end of duct or passageway, 20, through the check valve, 21, by means of a' grease gun 21', the lubricant being retained in the ducts or passageways after the removal oi the grease gun 21a by the'check valve, 21.

Grooves, 18, are disposed on the surface of plug, 13, 'so thatif said plug is shifted from closed to open position and viceversa, said passages will at no time register. or communicate with the openings through the tubular portion,

or liquid lubricant eifectually within said grooves, and as the lubricant is also kept from passing out of its inlet by the check valve, 21, proper lubrica tion to the plug and plug seat surfaces is assured at all times.

"The top housing, 10, surrounding the conical opening, 12, is provided with a relatively fiat surface, 22, and positioned thereupon is the outer portion of a diaphragm, 23, thatv is Perforated or provided with a centrally arranged opening for accommodation of the stem, l5.' l v Positioned immediately on` top of diaphragm, 23, is a plate, 25, the same being Secured to the casing, 10, in any suitable manner, preferably by means of bolts or studs, 26, andnuts, 2'1, and formed in the center of this plate is an opening, 28, for the accommodation of the stem, 15.

Formed on the under side of plate, 25, around I the centrally arranged opening therein is an annular'recess, 29. Arranged within this recess and resting .upon the inner edge of the diaphragm, 23, is an annular plate, 30, Provided adplate,'25, and housing, 10.

jacent to its inner edge with anupwardly pro- Jecting rib or iiange, 31, which latter serves as a bearing for the inner lower edge of a resilient member, preferably a dished metal ring, 32.

When the parts of the cock are properly as'- sembled and nuts, 27, are tightened to secure plate, 25, on housing, 10, Vthe pressure on the outer upper edge of theeresilient pressure member,.32, imparts downward` pressure to ring or annular plate, 30, and this pressure is transmit- Ated directly to the linner edge of the diaphragm. 23, and as a result a movable iluid pressure tight joint is maintainedbetween the innersurface of the diaphragm and the end of plug, 13. Diaphragm, 23, also provides a joint between the The diaphragm, 23, may be constructed of any suitable material; for instance, rubber, duck, asbestos, lead or copper, as best adaptable to the character of service in whichthe valve is applied. A packinglring or washer 24 is shown inbetween the top of the plug and the underside of the diaphragm; however, this ringl may or 'may not be used .depending upon the character ofI service the valve will operate under, and the underside of the diaphragm .may bear directly on a seat made on the end of theplug, the prin--v cipal feature ln-making the tight joint against the endA of the plug being tot have va diaphragm sufllciently exlbleto permit the resilient memberbackof sametobringthe diaphragmagainst a joint surfaceto prevent leakage across the end of the plug. 'I'he modified form vof diaphragm which bears directly onthe plug is shown in Fig.'4."1heuppersurface ofthisplug in thisR instance is provided with a projecting portionv upon which the dia' seats Formed the' lupper portionof stem, 15. is a arcuate slot or recess. 33. the-length of which isslihtly greater than 'and projecting intnsaid slot or from theadiacent elise-0l 91.312,25.

The parts just are arranged so that 134, aposition at vone end ofthe slot valveisinfullyclosedpositlmi,

' is rotated a quarterwofa the Joint bears directly on top`of plate. 35, thus holding the various movable parts of the valve in proper assembled relation. j

In the operation of my improved valve it is only necessary to engage the angular upper end, 1'1, of the stem with a suitable' handle ortool and rotate the plug, 13, so as to open or close the passageway through the housing, l0, or into position to control the now of fluid through said heus,- ing.L At all times the resilient member, 32, exerts constant pressure on the inner portion of the diaphragm to maintain a iiuid tight joint between the plug and the plate, 25, and which latter serves as a closure for the end of the valve housing and retains the plug in proper operative/position within said housing.

The resilient member 32 permits the valve to be raised oil its seat when lubricant is lintroduced under pressure between the surfaces of contact of the plug and casing. The member 32 normally exerts pressure upon the annular plate 30,

in turn exerting pressure upon the diaphragm 23 seat, it is obvious that these improvements are equally applicable to any plug cock which is arranged with lubricant passages which terminate against two seated valves, namely, the plug against the plug seat on the one end and the check valve against its seat on .the other end, the same purposes being served. by the invention whether the plug be seated lupwardly withthe large diameter of the taper at the 'bottom or downwardly with the small diameter of the taper at the bottom as .when the cock is set in normal operating positionin a pipeline, as shown in Fig; 1. In lthe practice or my invention r desire 1 it to be understood that when llubricant is introduced between the plug and plug'seat surfaces and the plug turned to Vsmear it over the the lubricant, and that as the nlm is exhausted the plug ilnally seated against its metallic seat in the During the time. that vthe lubricant film remains between plug and seat the conical metallic surfaces ofsame are slightly separated, permitting the pressure of theiluid now through` ilE isc

the cock to be transmitted ngamst'the lubricant s ii'lm into the lubricant esand against the check valve of the nlling inlet. f. In service, uponl the exhaustion of the lubricant by movement of the Iplus in. the ,seat or temperature v,of the iluid -lnlthe cock melting it,'for example, or any reason' causing the dissipatlono. the-lubricantthe check valve in the lubricant illling inlet is called upon, 1

1n meer leakage between the mettant ,mwen or .-40 blurand beat, to prevent the lescalle offpngure 'which lentersv the. lubricant :t f

met stunt ameno that n new mppiy armancantcanbeintroducedandreadyattachment: thehibrlcant compressor or gimmadewithoutthe ..1

hasard ofleaagafwhichis particularly eifel-ive the cock isfuaedin acid service.

rtwmbemauyl m'tnetisemnnnnuortm-nmml means for seating the diaphragm against the plug, lubricant passages between the plugand plug' seat surfaces, a lubricant filling inlet coinmunicating with said passages and a 'check valvein the lling inlet. i

2. In a plug cock, a'casing having a plug seat,

Y a plate aiiixedto the casing, a diaphragm between the'plate andthe' casing, -a plug-seated in the casing and rotatably held by the plate against ,vertical movement, a joint ring between the diaphragm and the'end of the plug and resilient for seating tle diaphragm against the il. 'In a .plug cock, a casing having a seat,

a plate afiixed to the casing, a diaphragm between the plate and the casing, a plug seated in the cas'- ing and rotatably and adjustably held by the plate against -verticalv movement, -a joint ring between the diaphragm and the end ofthe plug and resilient means for seating thel diaphragm against the ring.

4. In a plug cock, a casing having a plug seat, a plate aflixed to the casing. adiaphragm bethe casing and rotatably held by the plate against verticalmovement, a joint ring between the dia phragm and the end ofthe plug, resilient means for seating the diaphragm against thering, lubricant passages `between the plug 'and plug seat surfaces, a vlubricant filling inlet communicating with said passages and a check valve in the illling inlet,

v5. In a valve structure, the combination of a casing and a valve element seated therein. a

coverfor'the casing, a exible element clamped between the casing and the cover and engaging the valve element, an annular washer disposed within a `recess in said cover and surmounting the exible element, means within said' cover and j engaging said washer for seating the latter upon the flexible element, and means for forcing lubri I- cant between the valve element and its seat. L

6. In a valve structure, the combination d a casing and a valveelement seated therein, said valve element having an operating stem, a cover for the casing, a.V flexible element clamped be, tween the casingand the cover and enggingthe valve element, an annular washer-disposed within a recess in said cover and surmounting theflexible element, means within said cover and engaging saidwasher four seating the latter upon the flexible element, means adjustable with respect to the valve stem and operable on the oo ver to move the valve element longitudinally 0i' its seat, and .means for forcing lubricant betweenthe valve element and its seat to urge said valvef element in a longitudinal direction of the adjustable means.

7. In a valve structure, the combination of a casing and a rotatable valve element seated therein, an operating stem extending tromlsaid valve member, a cover for the casing, a diaphragm independently clamped between the casing" and the cover,andv

overlying the valve' element, a washer surinountingfthe diaphragm, and means for exerting pres- Lsure on said washertothereby seat the diaphragm against the valve element.

8. In a valve structure, the combination -ot a 'casing land Aa rotatable valve member seated therein, a cover for the a diaphragm clamped between the-.casing andthe cover and overlying the valve memben'and a interpod between and engaging the diaphragm and evalve memberA and spaced from the,

.9. .a plug valve structurethecombination I of a casing anda rotatable plugvalve. element seated therein, a cover for said casing, a iiexible element clamped between said casing and cover.

means engaging said iiexible element to resiliently seat it upon'the valve element, and-means for' the action of said seating means. l10. Ina: plug valve structure .the combination of a casing and a rotatable plu'g valve element seated therein, a cover for said casing, a dexible element clamped 'between 'said casing and cover, means engaging said flexible element to resiliently seatit upon the valve element, said valve ele` ill. In a lubricated plugvalve, a casing hav-` ing a taperedvalve seat and a tapered rotatable valve member engstgin'g-saidV seat, a cover for the casing, a stem extending ifrom the valve member through said cover and defining a shoulder on' said valve member,' a diaphragm clamped-between-the plate and the casing,aplug seated'in Hitting saidvalve element fromits seat against nog tween the casing and the coverand overlving said lubricant underpressure to said valve- -shoulder, means 'for resiliently seatinglthe dia- 

